反应详情

50 g (406 mmol) of 3-aminobenzyl alcohol are suspended in 750 ml of dichloromethane under a nitrogen atmosphere, the mixture is stirred at room temperature for 30 min and subsequently cooled to 0° C. 49 g (452 mmol) of ethyl chloroformate are slowly added dropwise. After the addition, the reaction mixture is stirred for 20 h and at the same time slowly warmed to room temperature. 300 ml of 1M potassium carbonate solution are added to the suspension formed (evolution of gas!). The organic phase is separated off, the aqueous phase is extracted with 200 ml of dichloromethane, the combined organic phases are washed with saturated sodium chloride solution, dried over sodium sulfate, and the solvent is removed by distillation.

1. temperaturesubsequently cooled to 0° C
2. additionAfter the addition
3. stirringthe reaction mixture is stirred for 20 h and at the same time
4. temperatureslowly warmed to room temperature
5. customformed (evolution of gas!)
6. customThe organic phase is separated off
7. extractionthe aqueous phase is extracted with 200 ml of dichloromethane
8. washthe combined organic phases are washed with saturated sodium chloride solution
9. dry with materialdried over sodium sulfate
10. customthe solvent is removed by distillation